“Bumblebee” is the latest installment in the “Transformers” series, but fortunately for humankind, it has little in common with its torturously bloated, unwatchable predecessors. This new sci-fi action adventure film explores revolutionary concepts like wit, charm and likable characters — as if the franchise had pleasantly mutated into a robotic version of “E.T.: The Extra-Terrestrial.” Consider this kinder, gentler “Transformers” project the biggest miracle of the holiday movie season. This is not to say that “Bumblebee” avoids the requisite CGI effects or big explosions — this is a “Transformers” movie, after all — but director Travis Knight uses these tools judiciously and to maximum effect. ...